Oxygen reduction on nanostructured platinum surfaces in acidic media: Promoting effect of surface steps and ideal response of Pt(1 1 1)

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Title: Oxygen reduction on nanostructured platinum surfaces in acidic media: Promoting effect of surface steps and ideal response of Pt(1 1 1)
Authors: Gómez Marín, Ana María | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Oxygen reduction reaction | Pt single crystals | Nanostructures surfaces | Reactivity | Electrocatalyst
Knowledge Area: Química Física
Issue Date: 15-Apr-2015
Publisher: Elsevier
Citation: Catalysis Today. 2015, 244: 172-176. doi:10.1016/j.cattod.2014.05.009
Abstract: In this paper, the role of surface steps on the electrocatalytic activity of platinum nanostructured surfaces for the oxygen reduction reaction (ORR) in acidic medium is evaluated by using stepped surfaces of structure Pt(S)[n(1 1 1) × (1 1 1)] with large terraces (20 ≤ n ≤ 50). It is realized that the inclusion of an even low amount of surface steps enhances the ORR, and linear activity trends are measured when currents at constant potential are plotted vs. the step density. As a consequence, an ideal ORR curve for a defect-free Pt(1 1 1) surface is extrapolated at zero defect density from experimental data and can be compared to that of a quasi-perfect Pt(1 1 1) electrode. It is clearly shown that surface steps promote the electrode activity toward ORR in acid medium. Results are discussed in light of available theoretical and experimental data.
Sponsor: This work has been financially supported by a grant from COLCIENCIAS and the Universidad Nacional de Colombia in the framework of the National Program of Formation in Innovation Leaders (Contract No. 472 of 2007). Support from the Spanish MICYNN though project CTQ2010-16271 and GV through PROM-ETEO/2009/045 (FEDER) are also greatly acknowledged.
URI: http://hdl.handle.net/10045/53165
ISSN: 0920-5861 (Print) | 1873-4308 (Online)
DOI: 10.1016/j.cattod.2014.05.009
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.cattod.2014.05.009
Appears in Collections:INV - EQSUP - Artículos de Revistas

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